Milling bit



FIG. 1 is a perspective view of a milling bit, according to the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines show portions of the milling bit which form no part of the claimed design. 

CLAIM The ornamental design for a milling bit, as shown and described. 